Trigonometry is derived from the Greek words trigonon (triangle) and metron (measure). It is a branch of Mathematics that deals with the relationships between the lengths and angles of the sides of triangles. A trigonometric equation is an equation involving one or more trigonometric ratios of unknown angles. It is expressed as ratios of sine(sin), cosine(cos), tangent(tan), cotangent(cot), secant(sec), and cosecant(cosec) angles. For example, cos2 x + 5 sin x = 0 is a trigonometric equation. All possible values which satisfy the given trigonometric equation are called solutions of the given trigonometric equation.
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